Ventilation may be defined, in its essential function, as a process of removing or supplying air by natural or mechanical means to or from an air source or any space. Good ventilation is an important factor in providing comfort in a building. Adequate ventilation (i.e., change of air in a room) is essential to maintain the temperature limits inside the building and to remove the air, vitiated by the products of respiration, bacteria and all objectionable or unpleasant odours. On the other hand, poor ventilation gives rise to a feeling of discomfort to the inhabitants, because it causes increase in temperature and humidity which leads to perspiration or sweating. The want of fresh air produces nausea, headache, sleepiness, laziness and unattentiveness.
A ventilator may be defrned as a narrow window of small height provided near the roof of a room for providing ventilation for the room.
There are two types of ventilators, namely,
- Wall ventilators, and
- Roof ventilators.
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